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Rolling control method for superfine structure low-carbon steel

A technology of controlled rolling and low-carbon steel, which is applied in the field of controlled rolling of ultra-fine grain carbon steel and low alloy steel, and can solve the problems of not considering the change of rolling pass interval structure, etc.

Inactive Publication Date: 2006-09-13
CENT IRON & STEEL RES INST
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  • Abstract
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Problems solved by technology

[0003] However, the current research on the DIFT rolling process only considers the structural changes that occur during the rolling deformation process, but does not consider the structural changes that occur within the rolling pass interval

Method used

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  • Rolling control method for superfine structure low-carbon steel
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  • Rolling control method for superfine structure low-carbon steel

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Embodiment Construction

[0009] Based on the above theoretical research, the present application proposes a set of new controlled rolling processes applicable to steels with different components (respectively referred to as steel A and steel B, see Table 1).

[0010] The process flow (process A) suitable for steel A is: first, heat at 1100-1250°C for 0.5-1 hour to make the steel billet completely austenitized, and then carry out 1-2 passes of recrystallization controlled rolling at 900-1000°C, The pass reduction is 20-30%; then 3-5 passes of deformation-induced ferrite transformation rolling are carried out at 850-750°C, the pass reduction is 30-50%, and the pass interval is less than 2s , Accelerated cooling at >10°C / s cooling rate after rolling.

[0011] The process flow (process B) suitable for steel B is: first heat at 1100-1250°C for 0.5-1 hour to make the steel billet completely austenitized and fully dissolve the microalloying elements, and then carry out 1-1 hour at 950-1100°C 2 passes of rec...

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Abstract

The present invention belongs to the field of low alloy steel producing technique. Low carbon steel containing C 0.05-0.20 wt%, Si 0.05-0.40 wt%, Mn 0.10-2.0 and Nb 0.03-0.10 wt% is first heated at 1100-1250 deg.c for 0.5-1 hr to make steel billet become austenic completely and dissolve microalloy elements fully; then re-crystallizing rolled at 950-1100deg.c for 1 or 2 gates of gauge reduction 20-30 % each; deforming ferrite inducing phase change rolling at 720-820 deg.c for 3-5 gates of gauge reduction 30-50 % each and gate interval time longer than 5 sec; and fast cooling higher than 10 deg.c / s after rolling. The said rolling process can obtain deformation inducing phase change ferrite of average crystal grain size not larger than 4 microns, volume fraction greater than 85 % and good structure homogeneity.

Description

technical field [0001] The invention belongs to the field of alloy steel production technology, and is particularly suitable for the controlled rolling method of superfine grain carbon steel and low alloy steel. Background technique [0002] Deformation Induced Ferrite Transformation (DIFT) refers to the A e3 When deformation is applied near the temperature, the energy of austenite increases and the stability decreases during deformation, which leads to the occurrence of γ→α phase transformation. The most notable features that distinguish it from the traditional γ→α phase transition are: (1) It is a dynamic phase transition, that is, the phase transition occurs during the deformation process, rather than during the isothermal or cooling process after deformation; (2) It can obtain super fine-grained ferrite. Researchers at home and abroad have paid great attention to this phenomenon, and successfully prepared ultra-fine grain steel by using DIFT process. For example, at t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C22C38/12
Inventor 孙新军刘清友董瀚
Owner CENT IRON & STEEL RES INST